Irgun had nothing to do with Deir Yassin, it was the Etzel and Lehi
https://www.youtube.com/watch?v=P8bkqqvoGpc
"Hannah Arendt and Albert Einstein, in a letter to The New York Times in 1948, compared Irgun and its successor Herut party to "Nazi and Fascist parties" and described it as a "terrorist, right wing, chauvinist organization" "